20171252770 has 16 divisors (see below), whose sum is σ = 37886875200. Its totient is φ = 7717696624.

The previous prime is 20171252687. The next prime is 20171252809. The reversal of 20171252770 is 7725217102.

It is a super-2 number, since 2×20171252770² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43850320 + ... + 43850779.

It is an arithmetic number, because the mean of its divisors is an integer number (2367929700).

Almost surely, 2^20171252770 is an apocalyptic number.

20171252770 is a deficient number, since it is larger than the sum of its proper divisors (17715622430).

20171252770 is a wasteful number, since it uses less digits than its factorization.

20171252770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87701129.

The product of its (nonzero) digits is 13720, while the sum is 34.

Adding to 20171252770 its reverse (7725217102), we get a palindrome (27896469872).

The spelling of 20171252770 in words is "twenty billion, one hundred seventy-one million, two hundred fifty-two thousand, seven hundred seventy".